Display device

ABSTRACT

A display device includes a backlight plate, a first panel and a second panel. The backlight plate includes a plurality of light emission zones. The first panel is disposed on the backlight plate, and the first panel includes a plurality of first pixels. The second panel is disposed on the first panel, and the second panel includes a plurality of second pixels. A diffusion plate disposed between the first panel and second panel. A number of light emission zones is less than or equal to a number of first pixels. The number of first pixels is less than a number of second pixels.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/416,679 filed on Nov. 2, 2016, which application is herebyincorporated by reference in its entirety

This Application claims priority of China Patent Application No.201710092767.5, filed on Feb. 21, 2017, the entirety of which isincorporated by reference herein.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

The disclosure relates to an electronic device, and more particularlyrelates to a display device.

Description of the Related Art

Flat panel displays are widely used because flat panel displays areprovided with some favorable advantages, these advantages include thinvolume, light weight, or low radiation. Different flat panel displays ofdisplay mediums are different. The display mediums can be classifiedinto self-luminous mediums or non-self-luminous mediums. Theself-luminous mediums comprise organic light-emitting diode (OLED), orplasma. The non-self-luminous mediums comprise liquid crystal. In theconventional method, a backlight plate serving as a light source in adisplay for the displays with non-self-luminous mediums. However, thebacklight plate is always turned on, and the backlight plate consumes agreat amount of power.

BRIEF SUMMARY OF THE DISCLOSURE

In accordance with an embodiment, a display device comprises a backlightplate, a first panel and a second panel. The backlight plate comprises aplurality of light emission zones. The first panel is disposed on thebacklight plate and comprises a plurality of first pixels. The secondpanel is disposed on the first panel and comprises a plurality of secondpixels. A diffusion plate is disposed between the first panel and secondpanel. A number of the light emission zones is less than or equal to anumber of the first pixels. The number of the first pixels is less thana number of the second pixels.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more fully understood by referring to thefollowing detailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a schematic diagram of an exemplary embodiment of a displaydevice, according to various aspects of the present disclosure.

FIG. 2A is a schematic diagrams of exemplary embodiments ofcorresponding relationships between first pixels and second pixels,according to various aspects of the present disclosure.

FIG. 2B is a schematic diagrams of exemplary embodiments ofcorresponding relationships between first pixels and second pixels,according to various aspects of the present disclosure.

FIG. 2C is a schematic diagrams of exemplary embodiments ofcorresponding relationships between first pixels and second pixels,according to various aspects of the present disclosure.

FIG. 3A is a structure schematic diagrams of exemplary embodiments of afirst panel and a second panel, according to various aspects of thepresent disclosure.

FIG. 3B is a structure schematic diagrams of exemplary embodiments of afirst panel and a second panel, according to various aspects of thepresent disclosure.

FIG. 4A shows corresponding relationships of exemplary embodiments ofthe first pixels and the second pixels, according to various aspects ofthe present disclosure.

FIG. 4B shows corresponding relationships of exemplary embodiments ofthe first pixels and the second pixels, according to various aspects ofthe present disclosure.

FIG. 5 is a schematic diagram of an exemplary embodiment of a backlightplate, according to various aspects of the present disclosure.

FIG. 6A is a schematic diagrams of exemplary embodiments of lightemission zones, according to various aspects of the present disclosure.

FIG. 6B is a schematic diagrams of exemplary embodiments of lightemission zones, according to various aspects of the present disclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE

The display device of the present disclosure and the structure of thedisplay device are described in detail in the following description. Inthe following detailed description, for purposes of explanation,numerous specific details and embodiments are set forth in order toprovide a thorough understanding of the present disclosure. The specificelements and configurations described in the following detaileddescription are set forth in order to clearly describe the presentdisclosure. It will be apparent, however, that the exemplary embodimentsset forth herein are used merely for the purpose of illustration, andthe inventive concept may be embodied in various forms without beinglimited to those exemplary embodiments. In addition, the drawings ofdifferent embodiments may use like and/or corresponding numerals todenote like and/or corresponding elements in order to clearly describethe present disclosure. However, the use of like and/or correspondingnumerals in the drawings of different embodiments does not suggest anycorrelation between different embodiments. In addition, in thisspecification, expressions such as “first material layer disposedon/over a second material layer”, may indicate the direct contact of thefirst material layer and the second material layer, or it may indicate anon-contact state with one or more intermediate layers between the firstmaterial layer and the second material layer. In the above situation,the first material layer may not be in direct contact with the secondmaterial layer.

FIG. 1 is a schematic diagram of an exemplary embodiment of a displaydevice, according to various aspects of the present disclosure. Thedisplay device 100 comprises a backlight plate 110, a first panel 120and a second panel 130. In one embodiment, the display device 100 may beflexible. In another embodiment, the first panel 120 or the second panel130 comprises a 3D glass. In this case, the 3D glass may be a curvedglass having one or more curvatures. The disclosure is not limit theapplication field of the display device 100. In one embodiment, thedisplay device 100 is applied in personal digital assistant (PDA),cellular phone, digital camera, television, global positioning system(GPS), car display, avionics display, digital photo frame, notebookcomputer or personal computer, or other suitable applications.

The backlight plate 110 comprises a plurality of luminescent elements.In the disclosure, the kind of luminescent elements is not limited. Inone embodiment, the luminescent elements may use inorganic materials,such as light-emitting diodes (LEDs), micro LEDs, mini LEDs. Detaileddescription, LED chip size may be defined as the existing chip about 200to 300 microns, LED chip size of small pitch display chip may be about150 microns, and LED chip size of mini LED may be about 50 to 60microns, and mini LED may be regarded as micro LED predecessor, and LEDchip size of micro LED may be only 15 microns.

In other embodiment, the luminescent elements may use organic materials,such as Organic Light-Emitting diodes (OLEDs). OLEDs can make thebacklight plate thinner and can be bent at will. In this embodiment, theluminescent elements are divided into light emission modules 111˜119.Each of the light emission modules 111˜119 comprises nine luminescentelements, but the disclosure is not limited thereto. In otherembodiments, the number of luminescent elements of one of the lightemission modules 111˜119 is the same as or different from the number ofluminescent elements of another of the light emission modules 111˜119.In this embodiment, each light emission module serves as a lightemission zone.

In the disclosure, the arranged sequence of the luminescent elements isnot limited. In this embodiment, the arrangements of the luminescentelements of one of the light emission modules 111˜119 are the same, butthe disclosure is not limited thereto. In other embodiment, thearrangement of the luminescent elements of one of the light emissionmodules 111˜119 is different from the arrangement of the luminescentelements of another of the light emission modules 111˜119. In thisembodiment, the backlight plate 110 controls the luminescent elements ofthe light emission modules 111˜119 according to a local dimmingtechnology. Therefore, each light emission module is individuallyactivated by the backlight plate. For example, when the luminescentelements of the first light emission module 111 are activated, at leastone of the luminescent elements of the light emission modules 112˜119are deactivated. Since the luminescent elements of a portion of thelight emission modules are activated, the power consumption of thebacklight plate 110 can be reduced or the contrast ration of thebacklight plate 110 is increased. In other embodiments, when theluminescent elements of the first light emission module 111 areactivated, the luminescent elements in at least one of the lightemission modules 112˜119 are activated. In this case, the brightness ofthe second light emission module 112 is lower than the brightness of thefirst light emission module 111. In some embodiments, the brightness ofthe second light emission module 112 is the same as the brightness ofthe first light emission module 111. In one embodiment, the number ofactivated luminescent elements in the second light emission module 112is less than the number of activated luminescent elements in the firstlight emission module 111.

Additionally, the brightness of each of the light emission modules111˜119 is individually controlled. For example, the luminescentelements of the first light emission module 111 are activated accordingto a driving signal, such as a current signal. In this case, thebrightness of the luminescent elements in the first light emissionmodule 111 is controlled by the amplitude or the duty cycle of thedriving signal. In one embodiment, the driving signal is a currentsignal or a voltage signal, but the disclosure is not limited thereto.For brevity, the light emitted from the first light emission module 111is referred to as specific light LT₁.

As shown in FIG. 1, the first panel 120 is disposed on the backlightplate 110 and comprises a plurality of first pixels 121. In oneembodiment, the shape of the first panel 120 may be rectangular,polygonal, curve, or other suitable shapes, but the disclosure is notlimited thereto. In other embodiments, the shape of the first panel 120is not rectangular. In some embodiments, the first panel 120 isflexible, but the disclosure is not limited thereto. In otherembodiments, each of the first pixels corresponds to a light emissionmodule. in other embodiments, many first pixels correspond to one lightemission module. For example, the region 140 of the first panel 120comprises four first pixels corresponding to the first light emissionmodule 111, but the disclosure is not limited thereto. Therefore, whenthe specific light LT1 is emitted from the first light emission module111, the specific light LT1 passes through the four first pixels in theregion 140. In other embodiments, the transmittance of the light throughthe first pixels of the region 140 is higher than the transmittance ofthe light through the other first pixels when the specific light LT1passes through the first pixels of the region 140 and the other firstpixels disposed out of the region 140. In this embodiment, each of thefour first pixels in the region 140 is capable of controlling thetransmittance of the light passing through it. When the specific lightLT1 passes through the four first pixels in the region 140, the fourfirst pixels in the region 140 form a light emission module. Forbrevity, the light passing through the first pixels of the region 140 isreferred to as light LT2.

In one embodiment, the first panel 120 comprises a first data driver 122and a first scan driver 123. The first scan driver 123 provides aplurality of scan signals to turn on the corresponding first pixels. Thefirst data driver 122 provides a plurality of data signals. Each datasignal controls the transmittance of the light passing through thecorresponding first pixels. For example, the transmittance of the lightpassing through the first pixels of the region 140 is controlled bycontrolling the brightness of the light LT₂ passing through the firstpixels of the region 140. In the disclosure, the kind of first panel 120is not limited. In one embodiment, the first panel 120 may be a liquidcrystal display (LCD), but the disclosure is not limited thereto. Anydisplay panel can serve as the first panel 120, as long as the displaypanel needs a light source provided by a backlight plate.

In this embodiment, the colors of the lights passing through the firstpixels 121 are the same as the color of the lights emitted from thebacklight plate 110. The color of the light emitted from the backlightplate 110 is white. Since the first panel 120 is utilized to regulatethe transmittances of the lights passing through the first pixels 121,the first panel 120 does not need a color filter. In this embodiment,the number of first pixels 121 is not limited. In one embodiment, thenumber of light emission zones of the backlight plate 110 is less thanor equal to the number of first pixels of the first panel 120. In otherwords, the resolution of the backlight plate 110 in pixels per inch(PPI) is less than or equal to the resolution of the first panel 120 inpixels per inch.

The second panel 130 is disposed on the first panel 120 and comprises aplurality of second pixels 131. In one embodiment, the shape of thesecond panel 130 may be rectangular, polygonal, curve, or other suitableshapes, but the disclosure is not limited thereto. In other embodiments,the shape of the second panel 130 is not rectangular. Additionally, thesecond panel 130 is flexible, but the disclosure is not limited thereto.In one embodiment, one of the second pixels 131 corresponds to one ofthe first pixels 121. In another embodiment, a portion of the secondpixels 131 corresponds to one of the first pixels 121.

For example, assuming that the second panel 130 comprises a region 150comprising sixteen second pixels. The sixteen second pixels in theregion 150 correspond to the four first pixels in the region 140 of thefirst panel 120, but the disclosure is not limited thereto. Therefore,the light LT₂ passing through the four first pixels in the region 140also passes the sixteen second pixels in the region 150. In this case,four second pixels in the region 150 correspond to one of the four firstpixels in the region 140. For brevity, the light passing through thefour second pixels of the region 150 is referred to as light LT₃.

In one embodiment, the second panel 130 comprises a second data driver132 and a second scan driver 133. The second driver 133 provides aplurality of scan signals to turn on a portion of the second pixels 131.The second data driver 132 provides a plurality of data signals. Each ofthe data signals is utilized to control the transmittance of the lightpassing through corresponding second pixels. Therefore, the intensity ofthe light LT₃ is controlled according to the transmittance of the lightpassing through the second pixels in the region 150.

In one embodiment, the second panel 130 may be a liquid crystal display,but the disclosure is not limited thereto. In other embodiments, anydisplay panel can serve as the second panel 130, as long as the displaypanel needs a light source emitted from a backlight plate. In oneembodiment, a quantum dot (QD) display serves as the second panel 130,for example, a quantum dot (QD) film may be coating on the substrate ofthe second panel, or the quantum dot (QD) Film may dispose on the secondpanel, and the quantum dot (QD) display has wider color gamutperformance, but the disclosure is not limited thereto. Furthermore, inthe embodiment, the colors of the lights emitted from the second panel130 may be red, green, blue or white. In this case, the second panel 130comprises a color filter. In one embodiment, each of the second pixels131 serves as a sub-pixel to display red light, green light, blue lightor white light. In another embodiment, each of the second pixels 131 isa pixel comprising three sub-pixels. In the present disclosure, thenumber of second pixels 131 is not limited. In one embodiment, thenumber of first pixels 121 is less than the number of second pixels 131.In this case, the resolution of the first panel 120 in PPI is less thanthe resolution of the second panel 130 in PPI.

FIGS. 2A-2C are schematic diagrams of exemplary embodiments ofcorresponding relationships between the first pixels and the secondpixels, according to various aspects of the present disclosure. Refer toFIG. 2A, the symbols 211˜213 represent the first pixels of the firstpanel 120, and the symbols 221˜223 represent the second pixels of thesecond panel 130. As shown in FIG. 2A, each of the first pixelscorresponds to one of the second pixels. For example, the first pixel211 corresponds to the second pixel 221, the first pixel 212 correspondsto the second pixel 222, and the first pixel 213 corresponds to thesecond pixel 223. In this case, the second pixels 221˜223 aresub-pixels. In another embodiment, each of the second pixels 221˜223comprises three sub-pixels.

In FIG. 2B, each of the first pixels corresponds to many second pixels.For example, the first pixel 231 corresponds to the second pixels241˜243, wherein the colors of the lights displayed by the second pixels241˜243 are different. In this case, each of the second pixels 241˜243is a sub-pixel. In some embodiments, each of the second pixels 241˜243comprises three sub-pixels. In other embodiments, each of the secondpixels 241˜244 comprises four sub-pixels, but the disclosure is notlimited thereto.

In FIG. 2C, the first pixel 251 corresponds to the second pixels261˜272. In this case, each of the second pixels 261, 264, 267 and 270displays light, such as red light. Additionally, each of the secondpixels 262, 265, 268 and 271 displays light, such as green light. Eachof the second pixels 263, 266, 269 and 272 displays light, such as bluelight. In this case, each of the second pixels 261˜272 is a sub-pixel.In other embodiments, each of the second pixels 261˜272 comprises threesub-pixels.

FIG. 3A is a structure schematic diagram of an exemplary embodiment ofthe first panel and the second panel, according to various aspects ofthe present disclosure. The first panel 310 comprises a first uppersubstrate 311, a first liquid crystal layer 312 and a first bottomsubstrate 313. The first liquid crystal layer 312 is disposed betweenthe first upper substrate 311 and the first bottom substrate 313. Thefirst bottom substrate 313 is disposed on a first bottom polarizer 352.The first liquid crystal layer 312 is disposed on the first bottomsubstrate 313. The first upper substrate 311 is disposed on the firstliquid crystal layer 312. In one embodiment, each of the first uppersubstrate 311 and the first bottom substrate 313 is a flexiblesubstrate. In the present disclosure, the materials of the first uppersubstrate 311 and the first bottom substrate 313 are not limited. In oneembodiment, the materials of the first upper substrate 311 or the firstbottom substrate 313 may be plastic films, such as polyimide (PI),polyethylene terephthalate (PET) or polycarbonate (PC), or othersuitable materials, but the disclosure is not limited thereto. Inanother embodiment, each of the first upper substrate 311 or the firstbottom substrate 313 may be flat glass or 3D glass, or other suitablematerials, but the disclosure is not limited thereto.

The second panel 320 comprises a second upper substrate 321, a secondliquid crystal layer 322 and a second bottom substrate 323. The secondliquid crystal layer 322 is disposed between the second upper substrate321 and the second bottom substrate 323. The second upper substrate 321is disposed under a second upper polarizer 353. The second liquidcrystal layer 322 is disposed under the second upper substrate 321. Thesecond bottom substrate 323 is disposed under the second liquid crystallayer 322. In one embodiment, each of the second upper substrate 321 andthe second bottom substrate 323 is a flexible substrate. In the presentdisclosure, the materials of the second upper substrate 321 and thesecond bottom substrate 323 are not limited. In one embodiment, thematerials of the second upper substrate 321 or the second bottomsubstrate 323 may be plastic films, such as PI, PET or PC. In anotherembodiment, each of the second upper substrate 321 or the second bottomsubstrate 323 may be flat glass or 3D glass, or other suitablematerials, but the disclosure is not limited thereto.

In this embodiment, a second bottom polarizer 354, an adhesive 330 and afirst upper polarizer 351 are disposed between the first panel 310 andthe second panel 320. The adhesive 330 may be an optical clear adhesive(OCA), an non-liquid film type adhesive, or other suitable materials,and the materials may be re-workablility and can configured to non-evensurfaces, Superior optical properties, or durability. The first upperpolarizer 351 is disposed on the first upper substrate 311. The secondbottom polarizer 354 is disposed under the second bottom substrate 323.The adhesive 330 is configured to stick the second bottom polarizer 354and the first upper polarizer 351 together.

As shown in FIG. 3A, the first upper substrate 311 comprises a firstsurface T1 and a second surface B1. The first surface T1 is opposite tothe second surface B1. In this embodiment, the second surface B1 iscloser to the first liquid crystal layer 312 than the first surface T1.The distance between the second surface B1 and the first liquid crystallayer 312 is shorter than the distance between the first surface T1 andthe first liquid crystal layer 312. Similarly, the second bottomsubstrate 323 comprises a third surface T2 and a fourth surface B2. Thethird surface T2 is opposite to the fourth surface B2. In thisembodiment, the third surface T3 is closer to the second liquid crystallayer 322 than the fourth surface B2. The distance between the thirdsurface T2 and the second liquid crystal layer 322 is shorter than thedistance between the fourth surface B2 and the second liquid crystallayer 322. The distance Y occurs between the third surface T2 and thesecond surface B1. The distance Y is the sum of the thicknesses of thesecond bottom substrate 323, the second bottom polarizer 354, theadhesive 330, the first upper polarizer 351 and the first uppersubstrate 311. In one embodiment, the distance Y is approximately in2000 um˜2100 um, but the disclosure is not limited thereto. In anotherembodiment, a color filter layer may be disposed between the secondbottom substrate 323 and the second upper substrate 321, for example thecolor filter layer may be disposed on array substrate (COA), or thecolor filter layer may be disposed on the other substrate of the secondpanel 320, but the disclosure is not limited thereto.

FIG. 3B is a structure schematic diagram of an exemplary embodiment ofthe first panel and the second panel, according to various aspects ofthe present disclosure. FIG. 3B is similar to FIG. 3A except for theaddition of a diffusion plate 340, the diffusion plate 340 is disposedbetween the first panel 310 and the second panel 320. A first adhesive331 disposed between the first panel 310 and the diffusion plate 340. Asecond adhesive 332 disposed between the second panel 320 and thediffusion plate 340. As shown in FIG. 3B, a first adhesive 331 isconfigured to adhere to the diffusion plate 340 and the first upperpolarizer 351. A second adhesive 332 is configured to adhere to thediffusion plate 340 and the second bottom polarizer 354. The firstadhesive 331 or the second adhesive 332 may be an optical clear adhesive(OCA) or other suitable material. When the resolutions of the firstpanel 310 or the second panel 320 are increased. The interferencefringes may be produced between a first image displayed by the firstpanel 310 and a second image displayed by the second panel 320. In thisembodiment, the diffusion plate 340 is configured to avoid theoccurrence of the interference fringes. In another embodiment, thediffusion plate 340 is configured to unify the brightness of the lightsderived from the first panel 310. Main material of diffusion plate 340may be PP, PET, PS, PC, PMMA, but the disclosure is not limited thereto.In this embodiment, the distance Y is the sum of the thicknesses of thesecond bottom substrate 323, the second bottom polarizer 354, the secondadhesive 332, the diffusion plate 340, the first adhesive 331, the firstupper polarizer 351 and the first upper substrate 311.

FIG. 4A shows a corresponding relationship of the first pixels and thesecond pixels, according to various aspects of the present disclosure.For clarity, a first panel 431 and a second panel 432 are shown. Thefirst panel 431 comprises a first pixel 411 and a first pixel 412. Thesecond panel 432 comprises a second pixel 420. In this embodiment, thesecond pixel 420 comprises three sub-pixels. Since the features of thefirst panel 431 and the second panel 432 are the same as the features ofthe first panel 120 and the second panel 130 shown in FIG. 1, thedescriptions of the first panel 431 and the second panel 432 areomitted.

As shown in FIG. 4A, when a user looks at the second panel 432 in theposition P1, the first pixel 411 of the first panel 431 needs to beturned on such that the light passes through the first pixel 411, andthen the user is capable of seeing the color displayed by the secondpixel 420 of the second panel 432. However, when the user looks at thesecond panel 432 in the position P2, the first pixel 412 of the firstpanel 431 needs to be turned on such that the light passes through thefirst pixel 412, and then the user is capable of seeing the color of thelight passing through the second pixel 420 of the second panel 432. Theangle θ₁ between the position P1 and the position P2 is referred to asthe viewing angle.

The pixels between the first pixel 411 and the first pixel 412 need tobe turned on so that the user is capable of seeing the color of thelight passing through the second pixel 420 when the user is standing inany position within the angle θ₁. In one embodiment, the pixels betweenthe first pixel 411 and the first pixel 412 are integrated together withthe first pixel 411 and the first pixel 412 into a single pixel. FIG. 4Bshows how the number of pixels in the first panel 431 and the number ofpixels in the second panel 432 are calculated. Assuming the medium, suchas the second bottom substrate 323 shown in FIG. 3A, the second bottompolarizer 354, the adhesive 330, the first upper polarizer 351 or thefirst upper substrate 311, disposed between the first panel 431 and thesecond panel 432 has an equivalent refraction index n₂, the equivalentrefraction index n₂ is equal to 1.5. Additionally, assume that themedium outside of the second panel 432 is air, and the equivalentrefraction index n₁ of the air is equal to 1.5.

According to Snell's Law, the relationship between the refraction indexn₁ and the refraction index n₂ is expressed by the following theequation (1):n ₁ sin θ₁ =n ₂ sin θ₂  (1)

Wherein θ₁ is the angle of refraction when the light travels through thesecond pixel 420, θ₂ is the angle of incidence when the light enters thesecond pixel 420. The distance d between the first pixel 411 and thefirst pixel 412 is expressed by the following equation (2):d=tan θ₂ ×Y  (2)

If we substitute equation (1) with equation (2), the substituted resultis expressed by the following equation (3):

$\begin{matrix}{d = {{\tan\left\lbrack {\sin^{- 1}\left( {\sin\;\theta_{1} \times \frac{n_{1}}{n_{2}}} \right)} \right\rbrack} \times Y}} & (3)\end{matrix}$

Assume that the maximum value of the viewing angle θ₁ is 85, therefraction index n₁ is 1 and the refraction index n₂ is 1.5. The angleθ₁, the refraction index n₁ and the refraction index n₂ are substitutedwith equation (3). The substituted result is expressed by the followingequation (4):d=0.89Y  (4)

Equation (4) is divided by the pixel pitch X of the second pixel 420.The divided result indicates the maximum value of the ratio relationshipof the number of first pixels of the first panel 431 and the number ofsecond pixels of the second panel 432. The divided result is expressedby the following equation (5):

$\begin{matrix}{\frac{R_{432}}{R_{431}} = {0.89^{2} \times \left( \frac{Y}{X} \right)^{2}}} & (5)\end{matrix}$

Wherein R₄₃₁ represents the number of the first pixels of first panel431, and R₄₃₂ represents the number of second pixels of the second panel432. In one embodiment, the pixel pitch X is the distance from thecenter of the second pixel 420 to the center of the next second pixel.

Assume that the minimum value of the viewing angle θ₁ is 40, therefraction index n₁ is 1 and the refraction index n₂ is 1.5. The angleθ₁, the refraction index n₁ and the refraction index n₂ are substitutedwith equation (3). The substituted result is expressed by the followingequation (6):d=0.47Y  (6)

Equation (6) is divided by the pixel pitch X of the second pixel 420.The divided result indicates the minimum value of the ratio relationshipof the number of first pixels of the first panel 431 and the number ofsecond pixels of the second panel 432. The divided result is expressedby the following equation (5):

$\begin{matrix}{\frac{R_{432}}{R_{431}} = {0.47^{2} \times \left( \frac{Y}{X} \right)^{2}}} & (5)\end{matrix}$

Equation (5) and equation (7) are combined to obtain the range of theratio relationship of the number of first pixels of the first panel 431and the number of second pixels of the second panel 432. The combinedresult is pressed by the following equation (8):

$\begin{matrix}{{0.2209 \times \left( \frac{Y}{X} \right)^{2}} \leq \frac{R_{432}}{R_{431}} \leq {0.7921 \times \left( \frac{Y}{X} \right)^{2}}} & (8)\end{matrix}$

Y is a distance between the second surface B1 and the third surface T2,X is a pixel pitch between the second pixels, R₁ is the number of thefirst pixels, and R₂ is a number of the second pixels.

In one embodiment, the pixel pitch of the second pixel 420 is between 80um and 90 um (80 um˜90 um). The designer determines the ratiorelationship of the number of first pixels of the first panel 431 andthe number of second pixels of the second panel 432 according toequation (8). In one embodiment, a single first pixel may correspond to18×18 second pixels.

FIG. 5 is a schematic diagram of an exemplary embodiment of thebacklight plate, according to various aspects of the present disclosure.The backlight plate 500 comprises a substrate 501, a reflecting medium502, a plurality of luminescent elements 503. The reflecting medium 502is disposed between the substrate 501 and the plurality of luminescentelements 503. The kind of substrate 501 that can be used is not limitedin the present disclosure. In one embodiment, the substrate 501 is aflexible printed circuit board (FPCB). The reflecting medium 502 isdisposed on the substrate 501. In one embodiment, the reflecting medium502 is a reflector. In this embodiment, the reflecting medium 502 has aplurality of openings. Each of the openings is configured to hold aluminescent element. In one embodiment, each of the luminescent elements503 is a light-emitting diode (LED), or light-emitting diode (LED) withQD materials, or light-emitting diode (LED) with light conversionmaterials, for example, QD materials or light conversion materials maybe encapsulate in LED, but the disclosure is not limited thereto.

In this embodiment, an optical film group 510 is disposed on thebacklight plate 500. As shown in FIG. 5, the optical film group 510comprises a diffusion substrate 504, a diffusion film 505, a firstbrightness enhancement film (BEF) 506, a second BEF 507 and a reflectiveBEF 508. The first brightness enhancement film (BEF) 506 is disposedbetween the first panel and the backlight plate 500. The diffusion film505 is disposed between the first BEF 506 and the backlight plate 500.The reflective BEF 508 is disposed between the first panel and the firstBEF 506. The second BEF 507 is disposed between the first BEF 506 andthe reflective BEF 508.

The diffusion substrate 504 is configured to unify the lights derivedfrom the luminescent elements 503 to avoid some of the lights beingespecially brighter than the others. In this embodiment, a gap 509occurs between the diffusion substrate 504 and the reflecting medium 502of backlight plate 500. To form the gap 509, the diffusion substrate 504is a hard substrate. The diffusion film 505 is disposed on the diffusionsubstrate 504 to again unify the intensity of the lights passing throughthe diffusion substrate 504. In one embodiment, the diffusion substrate504 or the diffusion film 505 can be omitted.

The first BEF 506 is disposed on the diffusion film 505 to change thedirection of the lights passing through the diffusion film 505. In thisembodiment, the first BEF 506 comprises a plurality of first patterns.Each of the first patterns extends in a first direction.

The second BEF 507 is disposed on the first BEF 506 to change thedirection of the lights passing through the first BEF 506. The secondBEF comprises a plurality of second patterns. Each of the secondpatterns extends in a second direction. The second direction isdifferent from the first direction. In this embodiment, the seconddirection may be perpendicular to the first direction, but thedisclosure is not limited thereto.

The reflective BEF 508 is disposed on the second BEF 507 to reflect thelights, which cannot pass through the first bottom polarizer 352 to goback to the backlight plate. After many reflections, the amount of thelights passing through the first bottom polarizer 352 is increased. Inone embodiment, the lights passing through the reflective BEF 508 canpass through the first bottom polarizer 352 shown in FIG. 3A. In thiscase, the reflective BEF 508 is capable of adjusting polarization statesof the lights, and the amount of the lights passing through the firstbottom polarizer 352 is increased.

FIG. 6A is a schematic diagram of an exemplary embodiment of the lightemission zones, according to various aspects of the present disclosure.The luminescent elements in light emission zone 611 form a rectangle.However, because the shape of the backlight plate is not rectangular, orthe backlight plate has a solid bending part, a portion of theluminescent elements in the light emission zone 611 is out of theboundary of the backlight plate. Therefore, the positions of the portionof the luminescent elements in the light emission zone 611 need to beadjusted. As shown in FIG. 6A, after the positions of the portion of theluminescent elements in the light emission zone 611 are adjusted, theshape of the light emission zone 612 is a trapezoid, but the disclosureis not limited thereto. The shape of the adjusted light emission zone612 may be any shape. In other embodiments, when a light emission zoneis located in the center of the backlight plate, the probability that aportion of the luminescent elements of the light emission zone is out ofthe boundary of the backlight plate is reduced. Therefore, the positionsof the luminescent elements of the emission area located in the centerof the backlight plate do not need to be adjusted. In one embodiment,the arrangement of the luminescent elements of the light emission zonelocated in the center of the backlight plate is different from thearrangement of the luminescent elements of the light emission zone nearthe boundary of the backlight plate.

FIG. 6B is a schematic diagram of another exemplary embodiment of thelight emission zones, according to various aspects of the presentdisclosure. When the shape of the backlight plate is not rectangular, orthe backlight plate has a solid bending part, a portion of theluminescent elements in the light emission zone 613 and a portion of theluminescent elements in the light emission zone 614 are out of theboundary of the backlight plate. To solve the above problem, in oneembodiment, the pitches between the luminescent elements of the lightemission zone 613 and the pitches between the luminescent elements ofthe light emission zone 614 are adjusted. The light emission zone 615indicates an adjustment result of the light emission zone 613. The lightemission zone 616 indicates an adjustment result of the light emissionzone 614. In other embodiments, when a light emission zone is near thecenter of the backlight plate, the probability that a portion of theluminescent elements of the light emission zone is out of the boundaryof the backlight plate is low. Therefore, the pitches between theluminescent elements of the light emission zone near the center of thebacklight plate may be higher than the pitches between the luminescentelements of the light emission zone near the boundary of the backlightplate.

Note that the above element sizes, element parameters, and elementshapes are not limitations of the present disclosure. Those skilled inthe art can adjust these settings or values according to differentrequirements. It should be understood that the display device and thestructure of the display device of the present disclosure are notlimited to the configurations of FIGS. 1, 2A˜2C, 3A˜3B, 4A˜4B, 5 and6A˜6B. The present disclosure may merely include any one or morefeatures of any one or more embodiments of FIGS. 1, 2A˜2C, 3A˜3B, 4A˜4B,5 and 6A˜6B. In other words, not all of the features shown in thefigures should be implemented in the display device and the structure ofthe display device of the present disclosure.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure belongs. It willbe further understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art andwill not be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

While the disclosure has been described by way of example, it is to beunderstood that the disclosure is not limited to the disclosedembodiments. On the contrary, it is intended to cover variousmodifications and similar arrangements (as would be apparent to thoseskilled in the art). For example, it should be understood that thesystem, device and method may be realized in software, hardware,firmware, or any combination thereof. Therefore, the scope of theappended claims should be accorded the broadest interpretation so as toencompass all such modifications and similar arrangements.

What is claimed is:
 1. A display device, comprising: a backlight platecomprising a plurality of light emission zones; a first panel disposedon the backlight plate and comprising a plurality of first pixels; asecond panel disposed on the first panel and comprising a plurality ofsecond pixels; and a diffusion plate disposed between the first paneland second panel; wherein a number of the light emission zones is lessthan or equal to a number of the first pixels, and the number of thefirst pixels is less than a number of the second pixels, wherein thefirst panel comprises a first upper substrate, a first liquid crystallayer and a first bottom substrate, the first liquid crystal layer isdisposed between the first upper substrate and the first bottomsubstrate, the first upper substrate comprises a first surface and asecond surface, and the second surface is closer to the first liquidcrystal layer than the first surface, wherein the second panel comprisesa second upper substrate, a second liquid crystal layer and a secondbottom substrate, the second liquid crystal layer is disposed betweenthe second upper substrate and the second bottom substrate, the secondupper substrate comprises a third surface and a fourth surface, and thethird surface is closer to the second liquid crystal layer than thefourth surface, wherein a ratio relationship between the number of thefirst pixels and the number of the second pixels is${{0.2209 \times \left( \frac{Y}{X} \right)^{2}} \leq \frac{R_{2}}{R_{1}} \leq {0.7921 \times \left( \frac{Y}{X} \right)^{2}}},$wherein Y is a distance between the second surface and the thirdsurface, X is a pixel pitch between the second pixels, R1 is the numberof the first pixels, and R2 is the number of the second pixels, andwherein Y is in 2000 um˜2100 um.
 2. The display device as claimed inclaim 1, wherein a resolution of the backlight plate is less than orequal to a resolution of the first panel, and the resolution of thefirst panel is less than a resolution of the second panel.
 3. Thedisplay device as claimed in claim 1, wherein a brightness of a firstlight emission zone of the plurality of light emission zones isdifferent from a brightness of a second light emission zone of theplurality of light emission zones when one of the first light emissionzone and the second first light emission zone is activated.
 4. Thedisplay device as claimed in claim 1, wherein the second panel furthercomprises a color filter layer disposed between the second bottomsubstrate and the second upper substrate.
 5. The display device asclaimed in claim 1, further comprising: a first brightness enhancementfilm disposed between the backlight plate and the first panel, whereinthe first brightness enhancement film comprises a plurality of firstpatterns extending along a first direction; and a second brightnessenhancement film disposed between the first brightness enhancement filmand the first panel, wherein the second brightness enhancement filmcomprises a plurality of second patterns extending along a seconddirection, and the second direction is different from the firstdirection.
 6. The display device as claimed in claim 1, wherein thebacklight plate comprises a substrate, a reflecting medium and aplurality of luminescent elements, the reflecting medium is disposedbetween the substrate and the plurality of luminescent elements, and thesubstrate is a flexible printed circuit board.
 7. The display device asclaimed in claim 1, wherein at least one of the first panel or thesecond panel is not rectangular.
 8. The display device as claimed inclaim 1, wherein each of the second pixels comprises three sub-pixels.9. The display device as claimed in claim 1, further comprising: a firstadhesive disposed between the first panel and the diffusion plate; and asecond adhesive disposed between the second panel and the diffusionplate.
 10. The display device as claimed in claim 9, the first adhesiveor the second adhesive is an optical clear adhesive.
 11. The displaydevice as claimed in claim 1, wherein each of the light emission zonescomprises a plurality of luminescent elements, an arrangement of theluminescent elements of a first light emission zone of the lightemission zones is different from an arrangement of the luminescentelements of a second light emission zone of the light emission zones.12. The display device as claimed in claim 11, wherein the luminescentelements are activated according to an amplitude or a duty cycle of adriving signal.
 13. The display device as claimed in claim 12, whereinthe driving signal is a current signal or a voltage signal.
 14. Thedisplay device as claimed in claim 1, wherein at least one of the firstpanel and the second panel is flexible.
 15. The display device asclaimed in claim 14, wherein at least one of the first panel and thesecond panel comprises a 3D glass.
 16. The display device as claimed inclaim 1, further comprising: an optical film group disposed on thebacklight plate, wherein the optical film group comprising: a firstbrightness enhancement film disposed between the first panel and thebacklight plate; a diffusion film disposed between a first brightnessenhancement film and the backlight plate; a reflective brightnessenhancement film disposed between the first panel and the firstbrightness enhancement film; and a second brightness enhancement filmdisposed between the first brightness enhancement film and thereflective brightness enhancement film.
 17. The display device asclaimed in claim 16, wherein the diffusion film is disposed on adiffusion substrate, and there is a gap between the diffusion substrateand a reflecting medium of the backlight plate.
 18. The display deviceas claimed in claim 16, further comprising: a polarizer disposed betweenthe reflective brightness enhancement film and the first panel.